HMC833LP6GE datasheet(49/61 Pages) HITTITE

49 / 61 page

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HMC833LP6GE

v01.1012

FRACTIONAL-N PLL WITH INTEGRATED VCO

25 - 6000 MHz

2.5

Reg 03h Frequency Register - Integer Part

(Default 000019h)

Bit

Type

Name

Width

Default

Description

[18:0]

R/W

intg

25d

VCO Divider Integer part, used in all modes, see (EQ 13)

Fractional Mode

min 20d

max 219 -4 = 7FFFCh = 524,284d

Integer Mode

min 16d

max 219-1 = 7FFFFh = 524,287d

2.6

Reg 04h Frequency Register - Fractional Part

(Default 000000h)

Bit

Type

Name

Width

Default

Description

[23:0]

R/W

frac

VCO Divider Fractional part (24-bit unsigned) see

Fractional Frequency Tuning

Used in Fractional Mode only (Nfrac= Reg 04h/224

min 0d

max 224-1

2.7

Reg 05h VCO SPI Register

(Default 000000h)

Bit

Type

Name

Width

Default

Description

[2:0]

R/W

VCO Subsystem_ID,

Internal VCO Subsystem ID

[6:3]

R/W

VCO Subsystem register address

For interfacing with the VCO please see section

1.19.

[15:7]

R/W

VCO Subsystem data

Note: Reg05h is a special register used for indirect addressing of the VCO subsystem. Writes to Reg05h are

automatically forwarded to the VCO subsystem by the VCO SPI state machine controller.

Reg05h is a Read-Write register. However, Reg05h only holds the contents of the last transfer to the VCO subsystem.

Hence it is not possible to read the full contents of the VCO subsystem. Only the content of the last transfer to the

VCO subsystem can be read. Please take note special considerations for AutoCal related to Reg05h

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